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Main / Optical interfaces / POTM -3214(CW)-8/16

PROFLEX™ POTM-3214(CW)-8/16 optical transmitters accept up to eight or sixteen audio channels with an independent gain controls and one RS-232 data signal to send over the single-mode optical fiber.

The eight-channel POTM-3214(CW)-8 module occupies one slot in the PROLFEX 1U/3U racks so that up to four transmitters fit into a 1U rack and up to fifteen into a 3U rack, the sixteen-channel POTM-3214(CW)-16 occupies two slots.

A POTM-3214 transmitter is intended to pair with PORC-3234 series receivers which are WDM/CWDM/single-signal compatible.

Available modifications:

The POTM-3214 accepts an analog and/or AES/EBU audio signal in any combination of inputs. At a receiving side the output standard may be chosen arbitrarily.

POTM-3214 optical transmitter (and PORC-3234 optical receiver) is featuring the PAL monitor output: the black-burst with the bargraph audio level (quasi-peak and VU) meters OSD.

POTM-3214-8/16 features:

• SRC on every AES/EBU input
• an independent gain controls on all channels (analog and digital)
• a built-in 1kHz tone generator
• a group select for audio embedding
• a bargraph audio level meter OSD at the PAL-monitor output
• RS-232 data transmission support (up to 150 kbps)
• CWDM/WDM/single-signal optical systems compatibility
• any combination of standards on audio inputs
• 24-bits audio ADC
• EDH status (min/hour) indication

Technical specifications

• Input
  • Analog audio input
    

    Input type	balanced
    Input impedance	> 10kOhm
    Connector	DHS -26 F
    Gain control	+/- 6dB
    Dynamic range	> 100dB
    Harmonic distortions + noise	< 0,006%
    Sampling	24bits/48kHz (20 MSB embedded)

  • AES/EBU input
    

    Input type	transformer-balanced
    Connector type	DHS - 26F
    Gain control	+/- 6dB
    Amplitude	0,2~4,0V
    Input impedance	110 Ohm
    Maximum input cable length	up to 100m of twisted pair
    Input sampling rate	32…48kHz
    Output sampling rate	48kHz (SRC on every input)

• Output
  • Optical output
    

    System Parameters	Single-signal	WDM	CWDM
    Laser diode type	FP	FP	DFB
    Wavelength	1310±20nm (1550±20nm by request)	1310±20nm and 1550±20nm	1270~1370nm, 1430~1610nm with 20nm steps
    Output optical power	0dBm	0dBm	0dBm
    Optical connector type	FC/PC	FC/PC	FC/PC

  • PAL monitor output with audio level bargraph OSD
    

    Connector type	BNC
    Amplitude	1000±20mV/75Ohm
    DAC	10bits
    Frequency response	<3dB at 5,5MHz

Simplified schematic diagram

POTM-3214-8 simplified schematics:

Depending on the model index (AA, EE or AE), the POTM-3214 accepts the input audio in analog, AES or in the combination of both standards respectively.

Along with the audio embedding, the audio processor also packs the RS-232 data stream.

The PAL monitor output provides the OSD of the bargraph audio level meters.

POTM-3214-8 rear panel:

The sixteen-channel modification, ?IOI-3214-16, is actually a combination of the two ?IOI-3214-8 internally cascaded one after another. The first instance embeds audio channels #01~08, the second instance - #09~16. The optical output is taken from the second unit.

POTM-3214-16 simplified schematics:

POTM-3214-16 rear panel:

Mechanical details

PROFLEX™ POTM-3214 series optical transmitter consists of two sub-boards: the frontal and the rear. A frontal sub-board is 100x220mm easily removable module, it carries the main functionality circuitry, buttons and indicators. The lever at the side is used to pull the module out from a rack. A rear sub-board is 100x100mm module fixed to a rack behind the backplane. To release the rear module one needs to unscrew it's rear panel. The frontal and the rear modules are connected via the backplane in the rack.

The sixteen-channel modification - the POTM-3214-16 - is a mechanically coupled pair of the POTM-3214 frontal modules, an insertion and removal is done by operating both levers simultaneously.

Controls and indicators

The indicators and the buttons are located at the front of the module.

POTM-3214-8 frontal panel:

POTM-3214-16 frontal panel:

The operation mode is selected from a list by toggling by the MODE button, the UP and DOWN buttons change the settings of the selected mode.

Modes of operation:

• GROUP – an audio group selection for the embedding
• TON – the 1kHz test-tone ON/OFF
• VU METR – the VU-meter type, it's OSD position, enable/disable
• GAIN – an audio gain controls for each channel or stereo pair
• CASCADE INP - lit when an embedded signal is present in the inter-module interface (channels 1~8) and therefore this module is embedding the channels number 9~16
• AES LOSS - lit if there is no AES signal on all inputs, blinks if at least one AES signal is lost (AE and EE modifications only)

The remote control and monitoring

The “PROFLEX” modular system provides the remote controls and monitoring capability. An optional CPU module installed in a rack connects to an IBM PC via the proprietary protocol and software package.